汾河二库水体富营养化调查

THE INVESTIGATION OF FENHE SECOND RESERVOIR'S EUTROPHICATION

[目的]了解汾河二库水体现阶段的富营养状况。[方法]通过检测水体的透明度、总氮、总磷、叶绿素-A、藻细胞密度等指标,并通过计算水质营养状态指数(TSI)对其富营养化作出综合评价。[结果]汾河二库枯水期和平水期水样透明度都低于GHZBI-1999《地表水环境质量标准》中的Ⅳ类标准;枯水期TN含量高于平水期,但均低于GB3838-2002《地表水环境质量标准》中的Ⅳ类标准;枯水期和平水期TP含量低于GB3838-2002《地表水环境质量标准》中的Ⅳ类标准;水样中叶绿素-a含量都未超过GHZBI-1999《地表水环境质量标准》中的Ⅳ类标准;TSI(SD)、TSI(TP)都大于50,TSI(chla)小于50;藻细胞总数在枯水期达到5.9×105个/L,明显多于平水期藻细胞总数(2.5×104个/L)。[结论]汾河二库尚未形成富营养化状态。

[ Objective] To know about the eutrophic condition of present Fenhe Second reservoir. [ Methods] The eutrophic level of Fenhe Second reservoir was evaluated through measuring transparence, total nitrogen （TN） concentration, total phosphorus （TP） concentration, ehlorephyll-α（Chla） level, total amount of the algal cells and eaeulating water trofie state index （TSI） . [Results] Water transparence in low water period and common water period was lower than the Ⅳ transparence standard of GHZBI-1999 《Surface Water Environment Quality Standard》 ; TN concentration in low water period was more than that in eomnaon water period, and they were lower than the Ⅳ TN standard of GB3838-2002 《Surface Water Environment Quality Standard》 ; TP concentration in two period was less than the Ⅳ TP standard of GB3838-2002 《Surface Water Environment Quality Standard》; Chla level did not exceed the Ⅳ ehlorephyll-α standard of GHZBI-1999 《Surface Water Environment Quality Standard》; TSI（SD） and TS（TP） was both more than 50, TSI（Chla） was less than 50; Total amount of the algal eeUs was 5.9×10^5/L, which was much more than that （2.5×10^4/L） in common water period. [Conclusion] Fenhe Second reservoir has not been formed the eutrophication.